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TLS Online TPP Program

#Question id: 13981

The Transpiration Ratio Measures the Relationship between Water Loss and Carbon Gain, which of the following statements about transpiration ratio is NOT true?

#Unit 6. System Physiology – Plant
  1. The concentration gradient driving water loss is about 50 times larger than that driving the influx of CO2 difference  is due to the low concentration of CO2 in air (about 0.03%) and the high concentration of water vapor within the leaf
  2. CO2 diffuses about 1.6 times more slowly through air than water does
  3. The CO2 molecule is larger than H2O and has a larger diffusion coefficient
  4. The concentration gradient driving uptake CO2 is about 50 times larger than that driving the water loss
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TLS Online TPP Program

#Question id: 12955

#Unit 7. System Physiology – Animal

Which of the following would tend to decrease GFR by more than 10% in a normal kidney?
TLS Online TPP Program

#Question id: 12956

#Unit 10. Ecological Principles

For  nearly 200  years, biogeographers have  noted that  the  tropics  have  more terrestrial species than  temperate regions. Which of the following is NOT a plausible explanation for this pattern?
TLS Online TPP Program

#Question id: 12957

#Unit 10. Ecological Principles

Dichlorodiphenyltrichloroethane is related to the phenomenon of:
TLS Online TPP Program

#Question id: 12958

#Unit 10. Ecological Principles

The Norway rat (Rattus Norvegicus), a widespread pest, was controlled for about a decade by the anticoagulant warfarin. This chemical substance, placed in food pellets, is absorbed by the intestinal tract and inhibits the clotting of blood. After a population decline for about 10 years, rat populations increased and stabilized. In one European population, as illustrated in the graph below, the percentage of rats resistant to warfarin has remained fairly stable over a number of years

Resistance to warfarin is governed by a dominant autosomal gene, R. More than 15 percent of the resistant animals are heterozygous at this locus (Rr). The table below indicates the response to warfarin and relative reproductive fitness of individuals that are homozygous or heterozygous for the dominant gene (R). The RR individuals have a 20-fold increase in vitamin K requirement over individuals.


Fitness is a measure of the reproductive success of a particular genotype. The highest fitness is 1.00.

The strong dependence of RR individuals on large quantities of vitamin K probably is responsible for
TLS Online TPP Program

#Question id: 12959

#Unit 10. Ecological Principles

Ozone layer depletion, since the 1970s, is primarily
TLS Online TPP Program

#Question id: 12960

#Unit 10. Ecological Principles

The Norway rat (Rattus Norvegicus), a widespread pest, was controlled for about a decade by the anticoagulant warfarin. This chemical substance, placed in food pellets, is absorbed by the intestinal tract and inhibits the clotting of blood. After a population decline for about 10 years, rat populations increased and stabilized. In one European population, as illustrated in the graph below, the percentage of rats resistant to warfarin has remained fairly stable over a number of years.

Resistance to warfarin is governed by a dominant autosomal gene, R. More than 15 percent of the resistant animals are heterozygous at this locus (Rr). The table below indicates the response to warfarin and relative reproductive fitness of individuals that are homozygous or heterozygous for the dominant gene (R). The RR individuals have a 20-fold increase in vitamin K requirement over individuals.

Fitness is a measure of the reproductive success of a particular genotype. The highest fitness is 1.00.
Which of the following is most likely correct concerning the gene for resistance to warfarin?